JP2017182349A - Display device with touch detection function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with a touch detection function, in which a wire of the display device can be used as a structure for the touch detection.SOLUTION: A display device with a touch detection function includes a display portion where a plurality of pixels is provided in a display area, a pixel signal line that transmits an image signal to the pixel, a non-display area wiring portion 300 including a wire electrically connected to the pixel signal line and extending in a Y direction outside the display area, and a second touch detection electrode STDL provided at a position overlapping with the non-display area wiring portion 300 in a non-contact state and having a longitudinal direction thereof coincide with an X direction.SELECTED DRAWING: Figure 14

Description

  The present invention relates to a display device with a touch detection function.

  In recent years, a so-called touch panel called a touch detection device capable of detecting an external proximity object has attracted attention. The touch panel is mounted or integrated on a display device such as a liquid crystal display device and used as a display device with a touch detection function. The display device with a touch detection function enables various information to be input using a touch panel instead of a normal mechanical button by displaying various button images and the like on the display device (for example, Patent Document 1).

  In addition, a fingerprint sensor may be provided in an electronic device including a display device. A fingerprint sensor detects the shape of a fingerprint by detecting the irregularities of the fingerprint of a human finger that has come into contact (for example, Patent Document 2). The detection result of the fingerprint sensor is used for personal authentication, for example.

JP 2004-317353 A JP 2003-90703 A

  Conventionally, a fingerprint sensor provided in an electronic device including a display device has a configuration independent of a configuration related to display output of the display device. For this reason, it is difficult to use the wiring included in the display device as a configuration related to touch detection such as a fingerprint sensor.

  It is an object of the present invention to provide a display device with a touch detection function that can use a wiring included in the display device as a configuration related to touch detection.

  One embodiment of the present invention is a display portion provided with a plurality of pixels in a display region, a pixel signal line for transmitting an image signal to the pixel, and a wiring electrically connected to the pixel signal line. A display area wiring section having wiring extending along a predetermined direction outside the display area, and a direction in which the longitudinal direction intersects the predetermined direction provided at a position overlapping the display area wiring section in a non-contact state And a touch detection electrode.

FIG. 1 is a block diagram illustrating a configuration example of a display device with a touch detection function according to the embodiment. FIG. 2 is a block diagram illustrating a main functional configuration of the first touch detection unit. FIG. 3 is an explanatory diagram showing a state in which a finger is not in contact with or in proximity to the basic principle of mutual capacitance type touch detection. FIG. 4 is an explanatory diagram showing an example of an equivalent circuit in a state where the finger shown in FIG. 3 is not in contact with or in proximity. FIG. 5 is an explanatory diagram showing a state in which a finger is in contact with or in proximity to the basic principle of mutual capacitance type touch detection. FIG. 6 is an explanatory diagram showing an example of an equivalent circuit in a state where the finger shown in FIG. FIG. 7 is a diagram illustrating an example of a waveform of a mutual capacitive touch detection drive signal and a first touch detection signal. FIG. 8 is a block diagram illustrating a main functional configuration of the second touch detection unit. FIG. 9 is a schematic diagram illustrating a mechanism of fingerprint detection by the second touch detection unit. FIG. 10 is a plan view schematically showing a configuration related to touch detection in the display device with a touch detection function. FIG. 11 is a cross-sectional view taken along the line B-B showing a schematic cross-sectional structure of the display device with a touch detection function. FIG. 12 is a circuit diagram illustrating a pixel array of the display unit with a touch detection function according to the embodiment. FIG. 13 is a perspective view illustrating a configuration example of an electrode that forms a capacitance. FIG. 14 is a schematic diagram showing a relationship between a configuration related to touch detection among the configurations formed or connected to the pixel substrate and the second touch detection electrode. FIG. 15 is a flowchart illustrating an example of a process flow when the second touch detection is performed. FIG. 16 is a diagram illustrating an arrangement example of the second touch detection electrodes. FIG. 17 is a diagram illustrating an arrangement example of the second touch detection electrodes. FIG. 18 is a diagram showing a modification of the embodiment according to the present invention. FIG. 19 is a schematic diagram illustrating a relationship between a configuration related to touch detection and a second touch detection electrode among the configurations formed or connected to the pixel substrate according to the second embodiment of the present invention. FIG. 20 is a flowchart illustrating an example of a process flow when the second touch detection is performed after the first touch detection. FIG. 21 is an explanatory diagram illustrating an example of driving in the code division selection method. FIG. 22 is a timing chart illustrating an example of a relationship between a drive signal and a drive signal output to a plurality of targets in the code division selection method. FIG. 23 is a table showing an example of a relationship between a target to which a positive sign is attached at the same timing and a target to which a reverse sign is attached at the same timing in the code division selection method. FIG. 24 is a schematic diagram illustrating an example of a configuration of a display device that does not have the configuration related to the first touch detection and has the configuration related to the second touch detection. FIG. 25 is a schematic diagram illustrating an example of a configuration in which the switching circuit is omitted. FIG. 26 is a schematic diagram illustrating an example of a case where the detection area by the second touch detection is distinguished and handled as a plurality of touch detection areas. FIG. 27 is a schematic diagram illustrating an example of an electronic device that uses the plurality of touch detection areas illustrated in FIG. 26 as individual input units.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with actual aspects for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited. It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

(Embodiment 1)
FIG. 1 is a block diagram illustrating a configuration example of the display device 1 with a touch detection function according to the embodiment. As shown in FIG. 1, the display device 1 with a touch detection function includes a display unit 10 with a touch detection function, a control unit 11, a gate driver 12, a source driver 13, a drive electrode driver 14, and a first touch detection. Unit 40 and a second touch detection unit 60. The display device with a touch detection function 1 is a display device in which the display unit with a touch detection function 10 has a built-in touch detection function. The display unit 10 with a touch detection function integrally includes a display panel 20 that uses a liquid crystal display element as a display element and a touch panel 30 that detects a touch operation on an image display area 101a (see FIG. 10) by the display panel 20. It is a device that has become. The display unit with a touch detection function 10 may be a so-called on-cell type device in which the touch panel 30 is mounted on the display panel 20. In the case of the on-cell type, the display panel 20 and the touch panel 30 are provided as separate components. The display panel 20 is not limited to a configuration using a liquid crystal display element as a display element. For example, the display panel 20 may be an organic EL display panel.

  As will be described later, the display panel 20 is an element that performs scanning by sequentially scanning one horizontal line at a time in accordance with the scanning signal Vscan supplied from the gate driver 12. The control unit 11 sends control signals to the gate driver 12, the source driver 13, the drive electrode driver 14, the first touch detection unit 40, and the second touch detection unit 60 based on the video signal Vdisp supplied from the outside. It is a circuit that supplies and controls these to operate in synchronization with each other.

  The gate driver 12 has a function of sequentially selecting one horizontal line as a display driving target of the display unit 10 with a touch detection function based on a control signal supplied from the control unit 11.

  The source driver 13 is a circuit that supplies a pixel signal Vpix to each sub-pixel SPix (to be described later) of the display unit 10 with a touch detection function based on a control signal supplied from the control unit 11.

  The drive electrode driver 14 is a circuit that supplies a drive signal Vcom to a drive electrode COML (to be described later) of the display unit 10 with a touch detection function based on a control signal supplied from the control unit 11.

  The touch panel 30 operates based on the basic principle of capacitive touch detection, performs a touch detection operation by a mutual capacitance method, and contacts an external conductor with a detection region including the display region 101a (see FIG. 10 and the like). Alternatively, proximity is detected. The touch panel 30 may perform a touch detection operation by a self-capacitance method.

  FIG. 2 is a block diagram showing the main functional configuration of the first touch detection unit 40. The first touch detection unit 40 is a circuit that detects the presence or absence of a touch on the touch panel 30 based on a control signal such as a clock signal supplied from the control unit 11 and a first touch detection signal Vdet1 supplied from the touch panel 30. is there. Further, the first touch detection unit 40 obtains coordinates at which touch input is performed when there is a touch. The first touch detection unit 40 includes a touch detection signal amplification unit 42, an A / D conversion unit 43, a signal processing unit 44, and a coordinate extraction unit 45. Based on the control signal supplied from the control unit 11, the detection timing control unit 46 controls the A / D conversion unit 43, the signal processing unit 44, and the coordinate extraction unit 45 to operate in synchronization.

  As described above, the touch panel 30 operates based on the basic principle of capacitive touch detection. Here, with reference to FIGS. 3 to 7, the basic principle of touch detection by the mutual capacitance method of the touch panel 30 of the present embodiment will be described. FIG. 3 is an explanatory diagram showing a state in which a finger is not in contact with or in proximity to the basic principle of mutual capacitance type touch detection. FIG. 4 is an explanatory diagram showing an example of an equivalent circuit in a state where the finger shown in FIG. 3 is not in contact with or in proximity. FIG. 5 is an explanatory diagram showing a state in which a finger is in contact with or in proximity to the basic principle of mutual capacitance type touch detection. FIG. 6 is an explanatory diagram showing an example of an equivalent circuit in a state where the finger shown in FIG. FIG. 7 is a diagram illustrating an example of waveforms of the drive signal Vcom and the first touch detection signal Vdet1. In the following description, a case where a finger touches or approaches is described. However, the present invention is not limited to the finger, and may be an object including a conductor such as a stylus pen. The drive signal Vcom is a description indicating a signal output to the drive electrode COML, and is not a description indicating a signal by a specific voltage.

  For example, as shown in FIG. 3, the capacitive element C <b> 1 includes a pair of electrodes, a drive electrode E <b> 1, and a touch detection electrode E <b> 2 that are disposed to face each other with the dielectric D interposed therebetween. As shown in FIG. 4, the capacitive element C1 has one end connected to an AC signal source (drive signal source) S and the other end connected to a voltage detector DET. The voltage detector DET is an integration circuit included in, for example, the touch detection signal amplifying unit 42 illustrated in FIG.

  When an AC rectangular wave Sg having a predetermined frequency (for example, about several kHz to several hundred kHz) is applied from the AC signal source S to the drive electrode E1 (one end of the capacitive element C1), the touch detection electrode E2 (in addition to the capacitive element C1) An output waveform (first touch detection signal Vdet1) as shown in FIG. 7 appears via the voltage detector DET connected to the (end) side. The AC rectangular wave Sg corresponds to, for example, the drive signal Vcom input from the drive electrode driver 14.

In a state where the finger is not in contact with or in close proximity (non-contact state), as shown in FIGS. 3 and 4, a current I ₀ corresponding to the capacitance value of the capacitive element C1 flows along with charging / discharging of the capacitive element C1. . The voltage detector DET shown in FIG. 4 converts the fluctuation of the current I ₀ according to the AC rectangular wave Sg into the fluctuation of the voltage (solid line waveform V ₀ (see FIG. 7)).

On the other hand, in a state where the finger is in contact or in proximity (contact state), as shown in FIG. 5, the capacitance C2 formed by the finger is in contact with or in the vicinity of the touch detection electrode E2, thereby driving. The fringe capacitance between the electrode E1 and the touch detection electrode E2 is blocked. For this reason, the capacitive element C1 acts as a capacitive element C1 ′ having a smaller capacitance value than the capacitance value in the non-contact state, as shown in FIG. When seen in the equivalent circuit shown in FIG. 6, the current I ₁ flows through the capacitor C1 '. As shown in FIG. 7, the voltage detector DET converts the fluctuation of the current I ₁ according to the AC rectangular wave Sg into the fluctuation of the voltage (dotted line waveform V ₁ ). In this case, the waveform V ₁ has a smaller amplitude than the waveform V ₀ described above. As a result, the absolute value | ΔV | of the voltage difference between the waveform V ₀ and the waveform V ₁ changes according to the influence of a conductor that is in contact with or close to the outside such as a finger. Note that the voltage detector DET accurately detects the absolute value | ΔV | of the voltage difference between the waveform V ₀ and the waveform V ₁ , so that the capacitance of the capacitor is adjusted according to the frequency of the AC rectangular wave Sg by switching in the circuit. More preferably, the operation is provided with a reset period during which the charge / discharge is reset.

  The touch panel 30 shown in FIG. 1 sequentially scans one detection block at a time in accordance with the drive signal Vcom supplied from the drive electrode driver 14 to perform touch detection by the mutual capacitance method.

  The touch panel 30 outputs a first touch detection signal Vdet1 for each detection block from a plurality of first touch detection electrodes TDL described later via the voltage detector DET illustrated in FIG. 4 or FIG. The first touch detection signal Vdet1 is supplied to the touch detection signal amplification unit 42 of the first touch detection unit 40.

  The touch detection signal amplifier 42 amplifies the first touch detection signal Vdet1 supplied from the touch panel 30. The touch detection signal amplifying unit 42 includes an analog LPF (Low Pass Filter) that is a low-pass analog filter that removes and outputs a high frequency component (noise component) included in the first touch detection signal Vdet1. Also good.

  The A / D conversion unit 43 samples the analog signals output from the touch detection signal amplification unit 42 at timing synchronized with the drive signal Vcom, and converts them into digital signals.

The signal processing unit 44 includes a digital filter that reduces frequency components (noise components) included in the output signal of the A / D conversion unit 43 other than the frequency obtained by sampling the drive signal Vcom. The signal processing unit 44 is a logic circuit that detects the presence or absence of a touch on the touch panel 30 based on the output signal of the A / D conversion unit 43. The signal processing unit 44 performs a process of extracting only a difference between detection signals by a finger. The difference signal by the finger is the absolute value | ΔV | of the difference between the waveform V ₀ and the waveform V ₁ described above. The signal processing unit 44 may perform an operation of averaging the absolute value | ΔV | per detection block to obtain an average value of the absolute value | ΔV |. Thereby, the signal processing unit 44 can reduce the influence of noise. The signal processing unit 44 compares the detected difference signal by the finger with a predetermined threshold voltage, and determines that the external proximity object is in a non-contact state if it is less than this threshold voltage. On the other hand, the signal processing unit 44 compares the detected difference signal by the finger with a predetermined threshold voltage, and determines that the contact state of the external proximity object is found when the signal is equal to or higher than the threshold voltage. In this way, the first touch detection unit 40 can perform touch detection. As described above, the first touch detection unit 40 detects the touch operation based on the change in the capacitance of the first touch detection electrode TDL.

  The coordinate extraction unit 45 is a logic circuit that calculates touch panel coordinates when a touch is detected by the signal processing unit 44. The coordinate extraction unit 45 outputs the touch panel coordinates as a detection signal output Vout1. As described above, the touch panel 30 according to the present embodiment can detect touch panel coordinates at a position where a conductor such as a finger contacts or approaches based on the basic principle of touch detection by a mutual capacitance method.

  FIG. 8 is a block diagram illustrating a main functional configuration of the second touch detection unit 60. The second touch detection unit 60 has a finer pitch than the first touch detection unit 40 based on a control signal such as a clock signal supplied from the control unit 11 and a second touch detection signal Vdet2 supplied from the touch panel 30. This is a circuit for detecting the presence or absence of touch. The second touch detection unit 60 includes, for example, a touch detection signal amplification unit 62, an A / D conversion unit 63, a signal processing unit 64, a coordinate extraction unit 65, a detection timing control unit 66, and a synthesis unit 67. Prepare. The functions of the touch detection signal amplification unit 62, the A / D conversion unit 63, the signal processing unit 64, the coordinate extraction unit 65, and the detection timing control unit 66 are the touch detection signal amplification unit 42, the A / D conversion unit 43, and the signal processing unit. 44, the function of the coordinate extraction unit 45, and the detection timing control unit 46. The relationship between the second touch detection unit 60 and the second touch detection electrode STDL (see FIG. 14 and the like) is the same as the relationship between the first touch detection unit 40 and the first touch detection electrode TDL. The second touch detection signal Vdet2 from the second touch detection electrode STDL is supplied to the touch detection signal amplification unit 62 of the second touch detection unit 60.

  FIG. 9 is a schematic diagram illustrating a mechanism of fingerprint detection by the second touch detection unit 60. For example, the combining unit 67 performs a touch operation on the second touch detection electrode STDL by combining a plurality of second touch detection signals Vdet2 obtained by a plurality of times of touch detection using the second touch detection electrode STDL. Two-dimensional information indicating the shape of the external proximity object is generated. Specifically, the combining unit 67 detects a difference in detection intensity that appears in accordance with a difference in the degree of contact with the cover member 5 (see FIG. 11) caused by unevenness of an external proximity object (for example, a human finger). Is generated as a shade of color (for example, gray scale). The output Vout2 of the second touch detection unit 60 having the synthesis unit 67 is, for example, the output of the two-dimensional information described above.

  In the present embodiment, it is assumed that a sweep operation is performed in which a human finger relatively moves in a direction intersecting the extending direction of one second touch detection electrode STDL. When the sweep operation is performed, as shown in FIG. 9, each of intersections of a plurality of drive electrodes SCOML described later and one second touch detection electrode STDL functions as an individual detection block, and unevenness due to the fingerprint of the finger The detection result corresponding to is output. Since the position of the finger adjacent to the second touch detection electrode STDL is changed at each time (reference characters T1, T2, T3,... Shown in FIG. 9) due to the movement of the finger by the sweep operation, the single second touch detection electrode STDL The finger can be scanned two-dimensionally. The synthesizing unit 67 obtains a two-dimensional image by combining the one-dimensional detection results in time series (codes T1, T2, T3,... In FIG. 9).

  In FIG. 9, two-tone detection indicating only the presence / absence of a touch is illustrated for the purpose of easy understanding, but in actuality, the touch detection result in each block can be multi-gradation. In FIG. 9, the detected external proximity object is an object having a double circular protrusion. However, when the external proximity object is a human finger having a fingerprint, a fingerprint appears as two-dimensional information. Become. Further, the function of the combining unit 67 may be included in a configuration other than the second touch detection unit 60. For example, the output Vout2 of the second touch detection unit 60 may be used as the output of the coordinate extraction unit 65, and an external configuration may generate two-dimensional information based on the output Vout2. Further, the configuration relating to the generation of the two-dimensional information may be hardware such as a circuit, or may be based on so-called software processing.

  Next, a configuration example of the display device 1 with a touch detection function will be described in detail. FIG. 10 is a plan view schematically showing a configuration related to touch detection in the display device 1 with a touch detection function. FIG. 11 is a cross-sectional view taken along the line BB showing a schematic cross-sectional structure of the display device 1 with a touch detection function. FIG. 12 is a circuit diagram illustrating a pixel array of the display unit 10 with a touch detection function according to the embodiment. As shown in FIG. 12, in the display area 101a of the display unit 10 with a touch detection function, a plurality of pixels are provided in the display area 101a as a configuration of the display panel 20. Hereinafter, when it is described as a display unit, it means a configuration formed in the display region 101a among the configurations of the display panel 20.

  As shown in FIG. 11, the display device with a touch detection function 1 includes a pixel substrate 2 and a counter substrate 3. The pixel substrate 2 and the counter substrate 3 are disposed so as to overlap each other. For example, as shown in FIG. 10, the display device with a touch detection function 1 includes a display area 101a for displaying an image and a frame area 101b outside the display area 101a. The display area 101a is, for example, a rectangular shape having long sides and short sides, but the shape of the display area 101a can be changed as appropriate. The frame area 101b has a frame shape surrounding part or all of the edge of the display area 101a.

  In the display area 101a, a plurality of drive electrodes COML and a plurality of first touch detection electrodes TDL are provided. The plurality of drive electrodes COML extend in a predetermined direction of the display region 101a and are arranged in parallel in a direction orthogonal to the one direction. Specifically, for example, the plurality of drive electrodes COML extend in a direction along one side of the rectangular display region 101a and are arranged in parallel in a direction along the other side orthogonal to the one side. For example, the first touch detection electrodes TDL extend in a direction orthogonal to a predetermined direction in which the plurality of drive electrodes COML extend, and are arranged in parallel in the one direction. The extending direction of the first touch detection electrode TDL is the X direction. The extending direction of the plurality of drive electrodes COML is defined as the Y direction. A direction orthogonal to the X direction and the Y direction is defined as a Z direction.

  The pixel substrate 2 includes a TFT substrate 21 as a circuit substrate, a plurality of pixel electrodes 22 arranged in a matrix above the TFT substrate 21, and a plurality of pixels provided between the TFT substrate 21 and the pixel electrode 22. Drive electrode COML, and an insulating layer 24 that insulates the pixel electrode 22 from the drive electrode COML. A polarizing plate 35B may be provided below the TFT substrate 21 via an adhesive layer.

  The counter substrate 3 includes a glass substrate 31 and a color filter 32 formed on one surface of the glass substrate 31. A first touch detection electrode TDL that is a detection electrode of the touch panel 30 is provided on the other surface of the glass substrate 31. Further, a polarizing plate 35A is provided above the first touch detection electrode TDL.

  The TFT substrate 21 and the glass substrate 31 are arranged to face each other with a predetermined interval through a spacer SP (see FIGS. 16 and 17). The liquid crystal layer 6 is provided in the space between the TFT substrate 21 and the glass substrate 31. The liquid crystal layer 6 modulates light passing therethrough according to the state of the electric field, and for example, a liquid crystal in a transverse electric field mode such as IPS (in-plane switching) including FFS (fringe field switching) is used. Note that alignment films may be provided between the liquid crystal layer 6 and the pixel substrate 2 and between the liquid crystal layer 6 and the counter substrate 3 shown in FIG.

  The TFT substrate 21 includes a thin film transistor element (hereinafter, TFT element) Tr of each sub-pixel SPix shown in FIG. 12, a pixel signal line SGL that supplies a pixel signal Vpix to each pixel electrode 22, and a drive signal that drives each TFT element Tr. Wirings such as scanning signal lines GCL for supplying Vcom are formed. The pixel signal line SGL and the scanning signal line GCL extend on a plane parallel to the surface of the TFT substrate 21. Here, the pixel signal line SGL functions as a wiring for transmitting the image signal Vpix to a plurality of pixels (sub-pixels SPix) provided in the display region 101a.

  The display panel 20 shown in FIG. 12 has a plurality of subpixels SPix arranged in a matrix. Each subpixel SPix includes a TFT element Tr and a liquid crystal element LC. The TFT element Tr is composed of a thin film transistor. In this example, the TFT element Tr is composed of an n-channel MOS (Metal Oxide Semiconductor) TFT. The source of the TFT element Tr is connected to the pixel signal line SGL, the gate is connected to the scanning signal line GCL, and the drain is connected to one end of the liquid crystal element LC. The liquid crystal element LC has one end connected to the drain of the TFT element Tr and the other end connected to the drive electrode COML.

  The subpixel SPix is connected to another subpixel SPix belonging to the same row of the display panel 20 by the scanning signal line GCL. The scanning signal line GCL is connected to the gate driver 12 (see FIG. 1), and the scanning signal Vscan is supplied from the gate driver 12. Further, the sub-pixel SPix is connected to another sub-pixel SPix belonging to the same column of the display panel 20 by the pixel signal line SGL. The pixel signal line SGL is connected to the source driver 13 (see FIG. 1), and the pixel signal Vpix is supplied from the source driver 13. Further, the sub-pixel SPix is connected to another sub-pixel SPix belonging to the same column by the drive electrode COML. The drive electrode COML is connected to the drive electrode driver 14 (see FIG. 1), and a drive signal Vcom is supplied from the drive electrode driver 14. That is, in this example, a plurality of subpixels SPix belonging to the same column share one drive electrode COML. The drive electrode COML of the present embodiment extends in parallel with the extending direction of the pixel signal line SGL and extends in a direction intersecting with the extending direction of the scanning signal line GCL. The drive electrode COML is not limited to this, and may extend in a direction parallel to the scanning signal line GCL, for example.

  The gate driver 12 shown in FIG. 1 is driven to sequentially scan the scanning signal lines GCL. The gate driver 12 applies a scanning signal Vscan (see FIG. 1) to the gate of the TFT element Tr of the sub-pixel SPix via the scanning signal line GCL, whereby one row (one horizontal line) of the sub-pixel SPix. Are sequentially selected as display drive targets. Further, in the display device 1 with a touch detection function, for the sub-pixel SPix belonging to one horizontal line, the source driver 13 applies the pixel signal Vpix to the selected one horizontal line via the pixel signal line SGL shown in FIG. This is supplied to the subpixel SPix constituting the line. In these subpixels SPix, display is performed one horizontal line at a time in accordance with the supplied pixel signal Vpix. When performing this display operation, the drive electrode driver 14 supplies a common potential for pixel drive to the drive electrode COML.

  In the color filter 32 illustrated in FIG. 11, for example, color regions of color filters colored in three colors of red (R), green (G), and blue (B) may be periodically arranged. Each of the sub-pixels SPix shown in FIG. 12 described above is associated with a set of three color areas of R, G, and B, and the unit pixel Pix is defined as a set of sub-pixels SPix corresponding to the three-color color areas. Composed. As shown in FIG. 11, the color filter 32 faces the liquid crystal layer 6 in a direction perpendicular to the TFT substrate 21. The color filter 32 may be a combination of other colors as long as it is colored in a different color. The color filter 32 is not limited to a combination of three colors, and may be a combination of four or more colors.

  The drive electrode COML functions as a common electrode that applies a common potential to the plurality of pixel electrodes 22 of the display panel 20, and also serves as an electrode that outputs a drive signal when performing touch detection by the mutual capacitance method of the touch panel 30. Also works. In addition, the drive electrode COML may function as a detection electrode when performing touch detection of the touch panel 30 by the self-capacitance method.

  FIG. 13 is a perspective view illustrating a configuration example of an electrode that forms a capacitance. The touch panel 30 includes a drive electrode COML provided on the pixel substrate 2 and a first touch detection electrode TDL provided on the counter substrate 3. The drive electrode COML includes a plurality of striped electrode patterns extending in the Y direction. The first touch detection electrode TDL includes a plurality of electrode patterns extending in a direction intersecting with the extending direction of the electrode pattern of the drive electrode COML. The first touch detection electrode TDL faces the drive electrode COML in a direction perpendicular to the surface of the TFT substrate 21 (see FIG. 11). Each electrode pattern of the first touch detection electrode TDL is connected to an input of the touch detection signal amplification unit 42 of the first touch detection unit 40 (see FIG. 1). Capacitances are respectively formed at intersections between the electrode patterns of the drive electrodes COML and the electrode patterns of the first touch detection electrodes TDL.

  For the first touch detection electrode TDL, the drive electrode COML, and the second touch detection electrode STDL, for example, a light-transmitting conductive material such as ITO (Indium Tin Oxide) is used. The shape of the electrodes used for touch detection, such as the first touch detection electrode TDL and the drive electrode COML, is not limited to a shape divided into a plurality of stripes. For example, the first touch detection electrode TDL and the drive electrode COML may have a comb-teeth shape or the like. Or the 1st touch detection electrode TDL and the drive electrode COML should just be divided | segmented into plurality, and the shape of the slit which divides the drive electrode COML may be a straight line, or may be a curve. The same applies to the shapes of the second touch detection electrode STDL and the drive electrode SCOML.

  In the touch panel 30, when performing the mutual capacitance type touch detection operation, the drive electrode driver 14 is driven to sequentially scan in a time division manner as the drive electrode block, so that one detection block of the drive electrode COML is sequentially selected. Is done. Then, by outputting the first touch detection signal Vdet1 from the first touch detection electrode TDL, touch detection of one detection block is performed. That is, the drive electrode block corresponds to the drive electrode E1 in the basic principle of the mutual capacitive touch detection described above, the first touch detection electrode TDL corresponds to the touch detection electrode E2, and the touch panel 30 is Touch input is detected according to this basic principle. As shown in FIG. 13, in the touch panel 30, the first touch detection electrodes TDL and the drive electrodes COML that intersect with each other constitute a capacitive touch sensor in a matrix. Therefore, by scanning over the entire touch detection surface of the touch panel 30, it is possible to detect the position where contact or proximity of the conductor from the outside has occurred.

  The touch detection surface of the touch panel 30 (for example, the surface on the opposite side of the counter substrate 3 in the translucent cover member 5 that is a covering member) is also a display surface on which display output by the display panel 20 is performed. Therefore, the display area 101a where display output by the display panel 20 is performed overlaps with the detection area where touch detection by the touch panel 30 is performed. The degree of superimposition of the display area 101a and the detection area is arbitrary. For example, it is preferable that the detection area covers the entire display area 101a.

  As described above, the touch panel 30 has a plurality of drive electrodes COML arranged in parallel in the detection region, a drive electrode COML that is in a non-contact position with the plurality of drive electrodes COML, and outputs the drive signal Vcom, and the capacitance. It has a plurality of first touch detection electrodes TDL arranged in parallel in the detection area at the position to be formed, and functions as a touch detection device that detects a touch operation on the detection area based on a change in capacitance.

  The drive of the drive electrode COML related to the touch detection in the display area 101 a based on the above principle is based on the operation of the drive electrode driver 14. Specifically, a switch circuit 110 and a shift register 130 that form the drive electrode driver 14 are formed on the pixel substrate 2.

  FIG. 14 is a schematic diagram illustrating a relationship between the configuration relating to touch detection among the configurations formed or connected to the pixel substrate 2 and the second touch detection electrode STDL. The switch circuit 110 is a circuit that connects either the potential line TSVCOM or the potential line TPL to the drive electrode COML so as to be switchable. By this switching, whether or not the drive signal Vcom is output to the drive electrode COML is switched. Specifically, when the potential line TSVCOM is connected, the drive signal Vcom is applied to the drive electrode COML. That is, the drive electrode driver 14 of this embodiment outputs the drive signal Vcom to the drive electrode COML by connecting the potential line TSVCOM and the drive electrode COML by the switch circuit 110. On the other hand, when the potential line TPL is connected, the drive signal Vcom is not applied to the drive electrode COML. The switch circuit 110 is provided so as to be able to individually switch the output of the drive signal Vcom for each of the plurality of drive electrodes COML.

  The shift register 130 shifts the drive electrode COML from which the drive electrode Vcom is output. Specifically, for example, the shift register 130 causes the switch circuit 110 to sequentially shift the drive electrode COML to which the drive signal is output from one end side to the other end side in the direction in which the plurality of drive electrodes COML are arranged. Make it work. The operation control of the shift register 130 is performed by a DDIC (Display Driver Integrated Circuit) 80, for example.

  For example, the DDIC 80 has functions related to the control unit 11, the gate driver 12, and the source driver 13. Further, external signals (for example, a video signal Vdisp, a fingerprint detection execution signal Vtouch, etc.) are transmitted to the DDIC 80 via the FPC 70 connected to the opposite side of the pixel substrate 2.

  In this embodiment, the DDIC 80 performs various controls related to touch detection. Specifically, the DDIC 80 operates the drive electrode driver 14 to output the drive signal Vcom to the drive electrode COML when the touch detection (first touch detection) is performed in the display area 101a, for example, and operates the first touch detection unit 40. Let The DDIC 80 outputs a driving signal to the outside-display-area wiring unit 300 to be described later and outputs a second touch detection unit when touch detection (second touch detection) is performed according to the fingerprint detection execution signal Vtouch, for example. 60 is operated.

  In the embodiment, for example, as shown in FIG. 10, the first touch detection unit 40 and the second touch detection unit 60 are provided in the FPC 70 by a so-called COF (Chip On Flexible) method, but this is a display with a touch detection function. This is a specific arrangement example of various integrated circuits included in the device 1 and is not limited to this, and can be changed as appropriate.

  Next, a description is given of the relationship between the wiring outside the display region and the second touch detection electrode STDL. The DDIC 80 is electrically connected to each component on the pixel substrate 2 through the display area outside wiring unit 300 and the switching circuit 150.

  The display area outside wiring unit 300 includes a wiring electrically connected to the pixel signal line SGL and extending outside the display area 101a. Specifically, the outside-display-area wiring unit 300 is a wiring that connects, for example, the DDIC 80 that functions as the source driver 13 and the pixel signal line SGL. The display area outside wiring unit 300 has a number of wires corresponding to the number of the pixel signal lines SGL. More specifically, the display area outside wiring unit 300 includes, for example, a pixel substrate wiring unit 310 and an extension unit 320. The pixel substrate wiring unit 310 includes a plurality of wirings formed on the pixel substrate 2 and outside the display area 101 a of the display panel 20. The wiring is, for example, a metal wiring formed in the same layer as the pixel signal line SGL, and one end side is connected to the pixel signal line SGL via the switching circuit 150. The extension part 320 is a wiring such as an FPC, for example. The extension part 320 is connected to the other end side of the pixel substrate wiring part 310 at one end side and connected to the DDIC 80 at the other end side, so that the pixel signal extended outside the display area 101 a by the pixel substrate wiring part 310. The input end of the line SGL and the output end of the DDIC 80 are connected.

  Note that the display area outside wiring unit 300 of the present embodiment includes the pixel substrate wiring part 310 and the extending part 320, which is a specific form of the display area outside wiring part 300. It is not limited to. The display area outside wiring unit 300 may include only the pixel substrate wiring unit 310, for example. In this case, the DDIC 80 is formed on the pixel substrate 2 by a mounting method such as COG (Chip On Glass), and is connected to the other end side of the pixel substrate wiring unit 310.

  Further, in FIG. 14 and the like, the width of one end side and the other end side of the extension part 320 are different. This is the width of the region where the other end side of the pixel substrate wiring part 310 is formed (for example, a predetermined one). (Width along the direction orthogonal to the direction) and the width of the DDIC 80 are different from each other, and therefore the wiring of the extending portion 320 is formed to converge in the direction from the other end of the pixel substrate wiring portion 310 toward the DDIC 80. It only shows. In the extended portion 320 shown in FIG. 14 and the like, the hatched portion where the other end side does not appear to be connected to the DDIC 80 side actually electrically connects the other end side of the pixel substrate forming portion and the DDIC 80. This is a portion where wiring to be connected is formed, and the shaded portion does not indicate non-connection on the other end side of the wiring.

  The switching circuit 150 switches between connection and disconnection between the display unit and the display area outside wiring unit 300. Specifically, the switching circuit 150 includes, for example, a switch provided so as to be interposed between one end side of the pixel substrate wiring unit 310 and an input end of the pixel signal line SGL. The switching circuit 150 operates to switch between connection (ON) and disconnection (OFF) between one end side of the pixel substrate wiring unit 310 and the input end of the pixel signal line SGL in accordance with the ON / OFF operation of the switch. The ON / OFF operation of the switching circuit 150 depends on, for example, a switching signal output from the DDIC 80. However, this is a form of operation control of the switching circuit 150 and is not limited to this, and can be changed as appropriate. .

  The second touch detection electrode STDL is provided at a position where a capacitance can be formed between the second touch detection electrode STDL and the outside-display-area wiring unit 300. Specifically, as shown in FIG. 11, for example, the second touch detection electrode STDL is formed on the polarizing plate 35A side of the cover member 5, and responds to application of a driving signal to the pixel substrate wiring unit 310 described later. A capacitance is formed between the pixel substrate wiring portion 310 formed on the pixel substrate 2. The capacitance changes according to a touch operation on the vicinity of the position where the second touch detection electrode STDL is formed. The output from the second touch detection electrode STDL based on the capacitance functions as the second touch detection signal Vdet2 in the second touch detection.

  In the present embodiment, the plurality of wirings included in the pixel substrate wiring unit 310 are along one predetermined direction. Further, the second touch detection electrode STDL is provided as an electrode whose longitudinal direction extends along a direction orthogonal to a predetermined direction, and the relationship between the plurality of wirings and the twist positions of the pixel substrate wiring unit 310 of the present embodiment. It has become. In the present embodiment, the width in the longitudinal direction of the second touch detection electrode STDL is the width of a region outside the display region 101a where a plurality of wirings included in the pixel substrate wiring part 310 are formed (a direction orthogonal to a predetermined one direction). ), The second touch detection electrode STDL has a width that covers all of the plurality of wirings included in the pixel substrate wiring portion 310. You may have.

  The display area outside wiring unit 300 functions as the drive electrode SCOML (see FIG. 9) in the second touch detection. Specifically, for example, the DDIC 80 outputs a driving signal to the outside-display-area wiring unit 300 in response to the fingerprint detection execution signal Vtouch. The fingerprint detection execution signal Vtouch is input from the outside, for example, when a signal serving as a trigger for performing the second touch detection is obtained. As a specific example, when the DDIC 80 transmits the first touch detection signal Vdet1 to an external device to which the display device with a touch detection function 1 is connected, based on the touch detection result indicated by the first touch detection signal Vdet1. The external device outputs the fingerprint detection execution signal Vtouch to the display device 1 with a touch detection function. As a result, the second touch detection is performed. The driving signal output from the DDIC 80 to the outside-display-area wiring unit 300 is touch detection by the second touch detection unit 60, that is, the second touch detection electrode STDL and the outside-display-area wiring unit 300 (for example, the pixel substrate wiring unit 310). ) Function as a drive signal Vcom in touch detection based on a change in capacitance formed between the two. The second touch detection unit 60 performs touch detection based on the second touch detection signal Vdet2 output from the second touch detection electrode STDL based on the capacitance. Note that, when the DDIC 80 functions as the source driver 13, the DDIC 80 outputs the pixel signal Vpix to each subpixel SPix via the display area outside wiring unit 300, the switching circuit 150, and the pixel signal line SGL. In this way, the second touch detection unit 60 functions as a touch detection unit that performs touch detection based on the capacitance formed between the display area outside wiring unit 300 and the touch detection electrode. Further, the capacitance formed at the time of the second touch detection is a touch detection signal (driving signal) output to the signal line by the circuit (DDIC 80) having a function of outputting the image signal Vpix when the touch is detected (second touch detection). ) At the time of output.

  FIG. 15 is a flowchart illustrating an example of a process flow when the second touch detection is performed. FIG. 15 is a flowchart showing the flow of processing when fingerprint detection using the second touch detection is adopted for standby release input that shifts the display device 1 with a touch detection function from the standby state to the display output operation state, for example. It is. In this case, the fingerprint detection execution signal Vtouch is input from the outside as the display device with a touch detection function 1 is put into a standby state. The display output operation state is, for example, a state where the first touch detection can be performed.

  The DDIC 80 causes the display device with a touch detection function 1 to stand by in a state where the second touch detection can be performed (step S1). When a finger sweep operation is started on the second touch detection electrode STDL in this state, a second touch detection signal Vdet2 indicating the proximity or contact of the finger is output from the second touch detection electrode STDL. By acquiring the second touch detection signal Vdet2 at every predetermined time (step S2), the unevenness of the fingerprint indicated by the second touch detection result (for example, see FIG. 9) is obtained (step S3). Thereafter, the DDIC 80 shifts the display device with a touch detection function 1 to a state where the first touch detection can be performed (step S4).

  In the present embodiment, the DDIC 80 turns on the switching circuit 150 when the display panel 20 operates, and turns off the switching circuit 150 when the second touch is detected. That is, the DDIC 80 turns on the switching circuit 150 when outputting the pixel signal Vpix to connect the display area outside wiring unit 300 and the pixel signal line SGL. Thereby, the pixel signal Vpix is transmitted to each sub-pixel SPix. On the other hand, when the second touch is detected, the DDIC 80 turns off the switching circuit 150 and disconnects the display area outside wiring unit 300 and the pixel signal line SGL. Further, the DDIC 80 may turn off the switching circuit 150 when detecting the first touch. As a result, the influence on the touch detection due to the coupling capacitance between the source and drain of the TFT element Tr can be more reliably suppressed.

  In the present embodiment, the pixel substrate wiring part 310 of the display area outside wiring part 300 is used as the drive electrode SCOML. However, the extension part 320 may be used as the drive electrode SCOML. When the extension part 320 is used as the drive electrode SCOML, the display device with a touch detection function 1 extends with the second touch detection electrode STDL such that the position of the extension part 320 with respect to the second touch detection electrode STDL is fixed. It is preferable that the electrostatic capacity formed between the wirings of the portion 320 is designed to be stable. Further, the position of the second touch detection electrode STDL may be a position where a capacitance outside the display area 300 and the capacitance is formed, and the specific position can be changed as appropriate.

  16 and 17 are diagrams illustrating examples of the arrangement of the second touch detection electrodes STDL. 16 and 17 illustrate a configuration example in the case where the display area outside wiring unit 300 and the DDIC 80 are mounted on the pixel substrate 2. That is, in FIG. 16 and FIG. 17, the display area outside wiring part 300 is all the pixel substrate wiring part 310. The second touch detection electrode STDL may be formed on the polarizing plate 35A side of the cover member 5 as shown in FIGS. 11 and 16, or the insulating layer 25 stacked on the pixel substrate 2 as shown in FIG. It may be formed on top. In the case of the configuration shown in FIG. 17, since the cover member 5 is not interposed between the second touch detection electrode STDL and the finger, it is easier to increase the sensitivity of the second touch detection. In addition, the second touch detection electrode STDL may be formed in the same layer as the first touch detection electrode TDL, and may be formed in other layers as long as the second touch detection electrode STDL is arranged so as to intersect the pixel substrate wiring part 310. good. Further, the second touch detection unit 60 illustrated in FIG. 14 and the like is included in the touch detection signal amplification unit 62 for the purpose of easily understanding the relationship with the basic principle of touch detection described with reference to FIG. 3 and the like. Although an integration circuit is illustrated, the actual configuration of the second touch detection unit 60 is as described with reference to FIG.

  As described above, according to the present embodiment, the second touch detection electrode STDL is a wiring electrically connected to the pixel signal line SGL and has a wiring extending outside the display area 101a. The second touch detection unit 60 performs the second touch detection based on the capacitance. Accordingly, the second touch detection is performed on the outside-display-area wiring unit 300 having the wiring that is inevitably provided as the wiring for inputting the pixel signal Vpix from the outside of the display device to the pixel signal line SGL that is the wiring of the display device. It can utilize as a structure concerning. Therefore, since the configuration can be shared between the display device and the configuration related to touch detection, it is easy to reduce the number of components of the display device 1 with a touch detection function. In addition, since the configuration related to the second touch detection can be provided integrally with the display device, it is easy to make the display device 1 with a touch detection function thinner.

  In addition, by including the switching circuit 150 that switches between connection and disconnection between the display unit and the outside-display-area wiring unit 300, the pixel signal line SGL is removed from the range in which the drive signal is transmitted, and the drive signal is transmitted. The length of wiring to be transmitted becomes shorter. Therefore, the potential of the driving signal for causing the pixel substrate wiring unit 310 to function as the driving signal SCOML is smaller.

  The capacitance is formed when a circuit (for example, DDIC 80) that outputs the image signal Vpix outputs a signal (driving signal) that is output to the pixel signal line SGL at the time of touch detection, so that the pixel signal is output. And a configuration for outputting a driving signal used in touch detection can be shared.

  In addition, since the touch panel 30 that detects a touch operation on the display area 101a is provided, both touch detection within the display area 101a and touch detection outside the display area 101a can be performed.

  Hereinafter, modified examples and other embodiments of the present invention will be described. The modification and other embodiments have the same configuration as that of the first embodiment except for matters to be noted.

(Modification)
FIG. 18 is a diagram showing a modification of the embodiment according to the present invention. The specific form of the outside-display-area wiring unit 300 is not limited to the embodiment illustrated in FIG. For example, as shown in FIG. 18, the extending direction of the wiring of the display area outside wiring unit 300 </ b> A may be a direction according to another configuration formed on the pixel substrate 2. Specifically, in the modification, the shift register 130A is arranged outside the display area with respect to the switching circuit 150. For this reason, in the modification, the wiring of the extending portion 321 is extended so as to avoid the mounting position of the shift register 130A. Note that the shift register 130A is connected to the switch circuit 110 via a relay wiring formed in a layer different from that of the pixel substrate wiring portion 310.

(Embodiment 2)
FIG. 19 is a schematic diagram showing the relationship between the configuration relating to touch detection among the configurations formed or connected to the pixel substrate 2 in Embodiment 2 of the present invention, and the second touch detection electrode STDL2. In the second embodiment, the first touch detection unit 40 and the second touch detection unit 60 are integrated into one circuit (integrated circuit 50). Thereby, mutual use of the touch detection result by the first touch detection and the touch detection result by the second touch detection becomes easier.

  Specifically, for example, when performing the second touch detection according to the fingerprint detection execution signal Vtouch, the integrated circuit 50 first uses the function of the first touch detection unit 40 to perform the first touch prior to the second touch detection. Perform detection. When a touch operation with a human finger is detected in the first touch detection, the integrated circuit 50 performs the second touch detection using the function of the second touch detection unit 60.

  More specifically, the integrated circuit 50 outputs, for example, the drive signal ExVCOM to the DDIC 80. The drive signal ExVCOM is, for example, a signal indicating whether the touch detection is performed and whether the touch detection to be performed is the first touch detection or the second touch detection. In addition to the output of the drive signal ExVCOM, the integrated circuit 50 outputs to the DDIC 80 information indicating the wiring of the outside-display-area wiring unit 300 that is the target of outputting the drive signal when the second touch is detected. The information may be information included in the drive signal ExVCOM, for example, or may be information indicated by an independent signal. Here, the wiring of the outside-display-region wiring unit 300 that is the target of outputting the driving signal is, for example, wiring provided in a range covered by the second touch detection electrode STDL2, and prior to the second touch detection. Wiring provided at a position corresponding to the position in the X direction of the finger specified by the first touch detection performed in the above.

  In response to the fingerprint detection execution signal Vtouch, the integrated circuit 50 outputs a drive signal ExVCOM indicating that the first touch detection is performed to the DDIC 80. The DDIC 80 operates the drive electrode driver 14 based on the drive signal ExVCOM, and outputs the drive signal Vcom to the drive electrode COML. The integrated circuit 50 performs the first touch detection by the first touch detection unit 40. Thereafter, the integrated circuit 50 provides information indicating the wiring of the outside-display-area wiring unit 300 that is the target of outputting the driving signal, based on the position in the X direction among the finger positions indicated by the detection result of the first touch detection. Output to DDIC 80. The DDIC 80 outputs a driving signal to a wiring that is a target for outputting a driving signal among the wirings of the display area outside wiring unit 300. The second touch detection unit 60 performs second touch detection on the assumption that a drive signal is output to the wiring of the outside-display-region wiring unit 300 indicated by the information. Thereby, the position where the second touch detection is performed can be made to follow the position of the finger obtained by the first touch detection.

  FIG. 20 is a flowchart illustrating an example of a process flow when the second touch detection is performed after the first touch detection. The integrated circuit 50 performs the first touch detection (step S11), and acquires information indicating the position in the X direction among the finger positions obtained by the first touch detection by the process of step S11 (step S12). The integrated circuit 50 outputs a driving signal to the wiring of the outside-display-area wiring unit 300 provided at the position corresponding to the position in the X direction obtained in step S12, and the first circuit is output at the position corresponding to the position in the X direction. Two-touch detection is performed (step S13).

  In FIG. 19, the second touch detection electrode STDL shown in FIG. 14 is suggested for the purpose of suggesting a configuration that facilitates the second touch detection according to the position of the finger in the X direction specified by the first touch detection. Although the second touch detection electrode STDL2 having a larger width in the longitudinal direction is illustrated, the width of the second touch detection electrode in each embodiment is arbitrary. Also in the second embodiment, even if the driving signal is output to all the wirings provided in the range covered by the second touch detection electrode STDL among the wirings included in the wiring part 300 outside the display area. Good.

  In the second embodiment, the touch detection execution timing is alternated with the display output timing on the display panel 20. Specifically, for example, a synchronization signal (VD / HD) output from the DDIC 80 at the time of display output in frame units is transmitted to the integrated circuit 50. Note that VD indicates a signal (vertical synchronization signal) indicating synchronization related to vertical driving of the display panel 20, and HD indicates a signal (horizontal synchronization signal) indicating synchronization related to horizontal driving of the display panel 20. . The integrated circuit 50 operates the first touch detection unit 40 according to the display output completion timing in units of frames obtained from the synchronization signal, and outputs the drive signal ExVCOM. The DDIC 80 operates the drive electrode driver 14 based on the drive signal ExVCOM, and outputs the drive signal Vcom to the drive electrode COML. Thereby, the first touch detection is performed at a timing after the completion of the display output.

  The DDIC 80 performs display output in the next frame unit according to the completion timing of the touch detection obtained from the drive signal ExVCOM. Thereafter, the integrated circuit 50 may further perform the first touch detection, or may perform the second touch detection according to the position of the finger specified by the immediately preceding first touch detection. The relationship between the display output timing and the touch detection execution timing may be the same in other embodiments and modifications such as the first embodiment.

(Embodiment 3)
FIG. 21 is an explanatory diagram illustrating an example of driving in the code division selection method. In Embodiment 1 etc. which were demonstrated above, the case where the drive electrode COML was driven individually was illustrated, However, The drive system of the drive electrode COML is not restricted to this. Specifically, for example, as illustrated in FIG. 21, in the display device 1 with a touch detection function, the drive electrode driver 14 includes a plurality (four in the example of FIG. 21) of drive electrode blocks Tx <b> 1. , Tx2, Tx3, and Tx4 are simultaneously selected and a drive signal Vcom whose phase is determined based on a predetermined code is supplied. In FIG. 21, the waveform shown on the right side of the drive electrode blocks Tx1, Tx2, Tx3, and Tx4 shows an example of the phase of the drive signal Vcom. For example, the predetermined code is defined by a square matrix of the following formula (1). The order of the square matrix in Expression (1) is 4, which is the number of drive electrode blocks Tx1, Tx2, Tx3, and Tx4 of the selected drive electrode block Bkn. The diagonal component “−1” of the square matrix of Expression (1) is different from the component “1” other than the diagonal component of the square matrix. The code “−1” is a code (reverse code) that supplies the drive signal Vcom determined to have a phase different from that of the code “1” (positive code). The drive electrode driver 14 and the like, based on the square matrix of the equation (1), the phase of the AC rectangular wave Sg described above corresponding to the component “1” other than the diagonal component of the square matrix and the diagonal component “ The drive signal Vcom is transmitted so that the phase of the AC rectangular wave Sg described above corresponding to “−1” is inverted. Each of the drive electrode blocks Tx1, Tx2, Tx3, and Tx4 is a predetermined number of drive electrodes COML.

  In the third embodiment, a plurality of drive electrode blocks Tx1, Tx2, Tx3, and Tx4 are simultaneously driven like the selection drive electrode block Bkn exemplified above, and detection is performed by a code division selection (CDM) method.

  For example, when there is an external proximity object CQ such as a finger in the drive electrode block Tx2, which is the second position from the scanning upstream of the drive electrode blocks Tx1, Tx2, Tx3, and Tx4 of the selected drive electrode block Bkn, external proximity is achieved by mutual induction. A difference voltage is generated by the object CQ (for example, the difference voltage is 20%). In this example, the second touch detection signal Vdet2 (Sensor Output Signal) detected by the second touch detection unit 60 at the first timing (first time zone) is (−1) + (0.8) + (1). + (1) = 1.8. This “1.8” is the signal strength based on the signal strength of the drive signal Vcom of the code “1”. The second touch detection signal Vdet2 detected by the second touch detection unit 60 at the next timing (second time zone) of the first time zone is (1) + (− 0.8) + (1) + ( 1) = 2.2. The second touch detection signal Vdet2 detected by the second touch detection unit 60 at the next timing (third time zone) of the second time zone is (1) + (0.8) + (− 1) + ( 1) = 1.8. The second touch detection signal Vdet2 detected by the second touch detection unit 60 at the next timing (fourth time zone) of the third time zone is (1) + (0.8) + (1) + (− 1) = 1.8.

  The coordinate extraction unit 65 in the third embodiment multiplies the second touch detection signal Vdet2 (Sensor Output Signal) detected by the signal processing unit 64 by the square matrix of Expression (1). The presence of an external proximity object CQ such as a finger at the position of the drive electrode block Tx2 of the selection drive electrode block Bkn is more accurate than time division selection (TDM) drive without increasing the voltage of the signal output as the drive signal Vcom. Detection is performed with a detection sensitivity (for example, 4 times).

  In the example with reference to FIG. 21, the CDM method using four drive electrode blocks Tx1, Tx2, Tx3, and Tx4 has been described for convenience. However, the number of drive electrode blocks that are simultaneously driven by the CDM method is arbitrary. The CDM method can be applied to both the first touch detection and the second touch detection.

  FIG. 22 is a timing chart showing an example of the relationship between the drive signal ExVCOM and the drive signals output to a plurality of objects in the CDM method. In FIG. 22, the target driven by the CDM method (the wiring of the driving electrode COML or the wiring part 300 outside the display area) is arranged along the alignment direction in Video <n>, Video <n + 1>, Video <n + 2>, Video <. n + 3>,...

  In the CDM method, the drive signal Vcom (or drive signal) is output to the drive electrode COML (or wiring) that is driven so as to indicate a positive sign with the same phase as the drive signal ExVCOM. On the other hand, the drive signal Vcom (or drive signal) is output to the drive electrode COML (or wiring) that is driven so as to indicate the opposite sign, with a phase opposite to that of the drive signal ExVCOM. In FIG. 22, objects to be driven so as to indicate opposite signs in each of the touch detections performed alternately with the display output are Video <n>, Video <n + 1>, Video <n + 2>, Video <n + 3>,. The example in which the transition is performed in this order and the other objects are driven so as to indicate a positive sign is shown. Note that the number of objects to be driven so as to indicate reverse signs at the same timing is not limited to one.

  FIG. 23 is a table showing an example of a relationship between a target to which a positive sign is attached at the same timing and a target to which a reverse sign is attached at the same timing in the CDM system. FIG. 23 illustrates the case where the number of targets (drive electrodes COML or wiring of the display area wiring unit 300) driven at the same timing in touch detection is 64, but this is only an example, It is not limited to. In the description with reference to FIG. 23, the execution timing of touch detection at the timing of the number (t: 1 to 12) described in the “time” column is described as “execution timing (t)”.

  For example, at the first implementation timing (1), all the objects (1 to 64) are driven so as to indicate a positive sign. At the next execution timing (2), the upstream half target (1 to 32) is driven so as to indicate a positive sign, and the downstream half target (33 to 64) is indicated to have a reverse sign. Driven. Targets driven at the subsequent execution timing (3) are positive signs in units of groups (1 to 16, 17 to 32, 33 to 48, 49 to 64) obtained by dividing the total number of targets from the upstream side by 1/4 units. And the reverse sign are driven individually. Specifically, the target (1-16, 33-48) is driven so as to show a positive sign, and the target (17-32, 49-64) is driven so as to show a reverse sign. The object to be driven at the subsequent execution timing (4) reverses the normal / reverse relationship of the sign of the group located on the most downstream side and the group located on the upstream side of the group with the previous execution timing (3). To be driven. Specifically, the target (1 to 16, 49 to 64) is driven so as to show a positive sign, and the target (17 to 48) is driven so as to show a reverse sign. Here, the objects (17 to 48) are objects obtained by combining the objects (17 to 32) and the symmetry (33 to 48).

  Targets to be driven at the subsequent execution timing (5) are groups (1 to 8, 9 to 16, 17 to 24, 25 to 32, 33 to 40, in which the total number of targets is divided in 1/8 units from the upstream side. 41 to 48, 49 to 56, and 57 to 64). Specifically, the target (1 to 8, 17 to 24, 33 to 40, 49 to 56) is driven so as to indicate a positive sign, and the target (9 to 16, 25 to 32, 41 to 48, 57). ˜64) are driven to indicate the opposite sign. The object to be driven at the subsequent execution timing (6) reverses the normal / reverse relationship of the sign of the group located on the most downstream side and the group located on the upstream side of the group with the previous execution timing (5). To be driven. Specifically, the target (1 to 8, 17 to 24, 41 to 48, 57 to 64) is driven so as to indicate a positive sign, and the target (9 to 16, 25 to 40, 49 to 56) is driven. Driven to show the opposite sign.

  The targets to be driven at the subsequent execution timing (7) are the codes of the group located upstream of the two groups to be replaced at the previous execution timing and the group located further upstream of the group. Is driven so as to reverse the normal / reverse relationship of the first and second implementation timings (6). Specifically, the target (1-8, 25-40, 57-64) is driven so as to show a positive sign, and the target (9-24, 41-56) is driven so as to show a reverse sign. The

  The object to be driven at the subsequent execution timing (8) reverses the normal / reverse relationship of the sign of the group located at the most downstream side and the group located at the upstream side of the group from the previous execution timing (7). To be driven. Specifically, the target (1-8, 25-32, 41-56) is driven so as to show a positive sign, and the target (9-24, 33-40, 57-64) shows a reverse sign. To be driven.

  As described above, in the CDM method, for example, according to the continuation of implementation, the number of targets constituting a group serving as a unit for switching the sign forward / reverse is reduced, and the target group located on the most upstream side is set as one of the groups. It is possible to switch the positive / reverse pattern of the code so that the sign is fixed, and the positive / negative of other groups is switched in order from the downstream side. At implementation timings (9) to (12), the normal code and the reverse code are individually switched in units of groups obtained by dividing the total number of objects by 1/16 unit. Although not shown, grouping and code switching can be performed with the same mechanism after the implementation timing (13). In FIG. 23, the most upstream group is fixed with a positive sign, but may be fixed with a reverse sign. Moreover, the relationship between the object to which the positive sign as shown in FIG. 23 is attached and the object to which the opposite sign is attached may be reversed.

  As described above, according to the third embodiment, the sensitivity of touch detection in the second mode is further increased. In particular, in the second touch detection, the parallel arrangement pitch of the objects to be driven is likely to be finer than that in the first touch detection. Therefore, the second touch detection is based on the capacitance generated according to the drive signal Vcom for one object. The degree of change in capacitance, that is, the degree of change in capacitance according to the presence or absence of a touch operation, tends to be smaller. For this reason, in the 2nd touch detection, the difficulty of ensuring the sensitivity of touch detection is increasing more. Under such conditions, it is easier to secure sufficient sensitivity, especially by adopting the CDM method for the second touch detection.

  The preferred embodiments and modifications (embodiments and the like) of the present invention have been described above, but the present invention is not limited to such embodiments and the like. The content disclosed in the embodiment and the like is merely an example, and various modifications can be made without departing from the spirit of the present invention. Appropriate changes made without departing from the spirit of the present invention naturally belong to the technical scope of the present invention.

  FIG. 24 is a schematic diagram illustrating an example of a configuration of a display device that does not have the configuration related to the first touch detection and has the configuration related to the second touch detection. The configuration related to the first touch detection, that is, the configuration related to touch detection in the display area 101a can be omitted. When the configuration related to the touch detection in the display area 101a is omitted, as shown in FIG. 24, the drive electrode COML provided in the above-described embodiment or the like has a film-like shape that is entirely continuous in the display area. The plate-like electrode BCOML is replaced. In addition, the configuration of the drive electrode driver 14 used for the first touch detection is also omitted. Specifically, the switch circuit 110, the shift register 130, and the potential line TSVCOM are omitted. The electrode BCOML is provided as a constant potential electrode that is electrically connected to the potential line TPL, for example.

  FIG. 25 is a schematic diagram illustrating an example of a configuration in which the switching circuit 150 is omitted. When the second touch is detected, it is not essential to disconnect the display area outside wiring unit 300 and the pixel signal line SGL by the switching circuit 150. As shown in FIG. 25, the switching circuit 150 can be omitted. In this case, the scanning signal Vscan is not output at the timing when the driving signal related to the second touch detection is output to the wiring part 300 outside the display area, and all the horizontal lines are not selected (OFF).

  FIG. 26 is a schematic diagram illustrating an example of a case where the detection area by the second touch detection is distinguished and handled as a plurality of touch detection areas B1, B2, and B3. FIG. 27 is a schematic diagram illustrating an example of an electronic device 400 that uses the plurality of touch detection areas B1, B2, and B3 illustrated in FIG. 26 as individual input units. As shown in FIG. 26, the detection area by the second touch detection may be divided into a plurality of touch detection areas B1, B2, and B3, and the touch detection results in each of the touch detection areas B1, B2, and B3 may be handled individually. . In this case, for example, as shown in FIG. 27, the second touch detection unit 60 can provide individual input units (for example, buttons in the button arrangement area TPB) in the plurality of touch detection areas B1, B2, and B3. The detected touch detection result can be used to detect the presence or absence of an input operation on each input unit.

  In FIG. 26, the second touch detection electrode STDL3 having a longer width in the longitudinal direction than the second touch detection electrode STDL and the like shown in FIG. 14 is illustrated for the purpose of showing a detection area by the second touch detection larger. However, as described in the description according to the second embodiment, the width of the second touch detection electrode is arbitrary. Further, the number of the plurality of touch detection areas by dividing the detection area by the second touch detection can be changed as appropriate.

  Further, the first touch detection and the second touch detection may be performed at different timings as described in the second embodiment, for example, and are not limited to the example described in the second embodiment, and are performed in parallel. Also good.

  In addition, the numerical items illustrated and illustrated such as the number of drive electrodes COML, the number of first touch detection electrodes TDL, the number of second touch detection electrodes STLD in the embodiments and the like are merely examples, and can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Display device with a touch detection function 2 Pixel substrate 3 Counter substrate 5 Cover member 6 Liquid crystal layer 10 Display unit with a touch detection function 11 Control unit 12 Gate driver 13 Source driver 14 Drive electrode driver 20 Display panel 21 TFT substrate 22 Pixel electrode 30 Touch panel 31 Glass substrate 32 Color filter 40 First touch detection unit 42, 62 Touch detection signal amplification unit 43, 63 A / D conversion unit 44, 64 Signal processing unit 45, 65 Coordinate extraction unit 46, 66 Detection timing control unit 50 Integrated circuit 60 Second touch detection unit 67 Composition unit 70 FPC
80 DDIC
101a Display area 101b Frame area 110 Switch circuit 130, 130A Shift register 150 Switching circuit 300 Outside display area wiring section 310 Pixel substrate wiring section 320, 321 Extension section 400 Electronic device B1, B2, B3 Touch detection area BCOML electrode COML Drive electrode GCL scan signal line Pix unit pixel SGL pixel signal line SPix subpixel STDL, STDL2, STDL3 second touch detection electrode TDL first touch detection electrode TSVCOM potential line TPB button arrangement area TPL potential line Vcom drive signal Vdet1 first touch detection signal Vdet2 Second touch detection signal Vdisp Video signal Vpix Pixel signal Vscan Scan signal Vtouch Fingerprint detection execution signal

Claims (7)

A display unit provided with a plurality of pixels in the display region;
A pixel signal line for transmitting an image signal to the pixel;
A wiring part electrically connected to the pixel signal line and having a wiring extending outside the display area along a predetermined direction;
A display device with a touch detection function, comprising: a touch detection electrode provided at a position overlapping with the wiring portion outside the display area in a non-contact state and having a longitudinal direction intersecting the predetermined direction. The display device with a touch detection function according to claim 1, further comprising a switching circuit that switches between connection and disconnection between the display unit and the wiring unit outside the display area. The display device with a touch detection function according to claim 1, wherein the electrostatic capacitance is formed when a circuit that outputs the image signal outputs a signal that is output to the pixel signal line during touch detection. The display device with a touch detection function according to claim 1, further comprising a touch panel that detects a touch operation on the display area. The display device with a touch detection function according to claim 4, wherein the detection of the touch operation outside the display area and the detection of the touch operation in the display area are performed at different timings. The display device with a touch detection function according to claim 4, wherein the detection of the touch operation outside the display area and the detection of the touch operation in the display area are performed in parallel. The touch detection electrode according to any one of claims 1 to 6, wherein the touch detection electrode is a mutual capacitance type touch detection electrode that forms a capacitance with the wiring of the wiring portion outside the display area. Display device.

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